If you want a very simple to do screen, go buy a 4 x 8 piece of masonite. One side is perforated, one side is smooth, your choice.

Attach to your wall using mirror supports, available at hardware stores. Buy a gallon of pastel base white and an oz or two of lamp black colorant, then mix to a very light shade of grey. Be careful, a little black goes a long way. I suggest using a quart jar rather than mixing in the whole gallon.

Using the paint method gives you GREAT flexibility for trying different shades of grey to best suit your needs.

Bob,
I followed Bwolff's research posts and my variation has worked well for me. I wanted to try my hand a DIY custom sized screen before I threw down cash for a REAL screen. After putting together my frame, I went to Wal-Mart and purchased two King sized flat sheets. They were cheap and disposable if this project didn't work out. I placed a 180 thread count black sheet over the frame and stapled in place. Over the black sheet, I placed a 200 count white sheet, made by Cannon, and again stapled in place. The black backed sheet seems to give the white sheet a grayish tint that makes the blacks blacker and doesn't really effect the whites that much. Applying two layers of white makes the whites whiter, but the blacks now have a grayish look. My total cost was about $50. I finished out the screen with black felt wrapped 2" foam border. The screen is light enough that you can hold the 60" X 104" screen in one hand. This will satisfy me until something strikingly different comes along. BTW, I'm using the Sony W400Q projector at a distance of 14.5 feet. Good luck. MD